more management via flees-manager

data/config.json.example

@@ -1,11 +1,13 @@
 {
   "__comment": [
+    "public_url: used for displaying REST API URLs in the command line utility",
     "workers: number of parallel processes. single long upload reserves a process.",
     "timeout: seconds for process to last. single long upload cant take longer than this.",
     "uid: Docker runs as root, this changes owner of written files. -1 to skip chowning",
     "max_zip_size: dont allow zip downloads if folder size exceeds this many megabytes",
     "app_secret_key: used to encrypt session cookie"
   ],
+  "public_url": "https://my.server.com/flees",
   "workers": 8,
   "timeout": 3600,
   "uid": 1000,